Quite the loaded question. Entire papers dedicated to only certain aspects of your question have been done on various subjects.
r1balla brings up some good points. Could a teenager benefit from a multivitamin and some protein supplements - probably. Could a teenage do some serious harm using stimulants and hormone supplements - definitely. Is it easier for teenagers to develop psychological addictions to supplements and progress to "harder" supplements/steroids - absolutely.
I suggest you do some research on your own - use googlescholar - you'll be amazed what you come up with.
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